gistfile1.txt

override func viewDidLoad() {
        super.viewDidLoad()
       
        faceBookLogIn.readPermissions = ["public_profile", "email", "user_friends"]
        faceBookLogIn.delegate = self
        
        //        第一次登入後可取得使用者token，後續即可直接登入
        if (FBSDKAccessToken.current()) != nil{
//            fetchProfile()
        }
        
        // Do any additional setup after loading the view, typically from a nib.
    }